diff --git a/bootstrap/helpers/docker.php b/bootstrap/helpers/docker.php
index 77e8b7b07..7b74392cf 100644
--- a/bootstrap/helpers/docker.php
+++ b/bootstrap/helpers/docker.php
@@ -1006,6 +1006,7 @@ function convertDockerRunToCompose(?string $custom_docker_run_options = null)
         '--ulimit' => 'ulimits',
         '--privileged' => 'privileged',
         '--ip' => 'ip',
+        '--ip6' => 'ip6',
         '--shm-size' => 'shm_size',
         '--gpus' => 'gpus',
         '--hostname' => 'hostname',
diff --git a/bootstrap/helpers/proxy.php b/bootstrap/helpers/proxy.php
index ac52c0af8..27637cc6f 100644
--- a/bootstrap/helpers/proxy.php
+++ b/bootstrap/helpers/proxy.php
@@ -127,10 +127,44 @@ function connectProxyToNetworks(Server $server)
     return $commands->flatten();
 }
 
+/**
+ * Generate shell commands to fix a Docker network that has an IPv6 gateway with CIDR notation.
+ *
+ * Docker 25+ may store IPv6 gateways with CIDR (e.g. fd7d:f7d2:7e77::1/64), which causes
+ * ParseAddr errors in Docker Compose. This detects the issue and recreates the network.
+ *
+ * @see https://github.com/coollabsio/coolify/issues/8649
+ *
+ * @param  string  $network  Network name to check and fix
+ * @return array Shell commands to execute on the remote server
+ */
+function fixNetworkIpv6CidrGateway(string $network): array
+{
+    return [
+        "if docker network inspect {$network} >/dev/null 2>&1; then",
+        "  IPV6_GW=\$(docker network inspect {$network} --format '{{range .IPAM.Config}}{{.Gateway}} {{end}}' 2>/dev/null | tr ' ' '\n' | grep '/' || true)",
+        '  if [ -n "$IPV6_GW" ]; then',
+        "    echo \"Fixing network {$network}: IPv6 gateway has CIDR notation (\$IPV6_GW)\"",
+        "    CONTAINERS=\$(docker network inspect {$network} --format '{{range .Containers}}{{.Name}} {{end}}' 2>/dev/null)",
+        '    for c in $CONTAINERS; do',
+        "      [ -n \"\$c\" ] && docker network disconnect {$network} \"\$c\" 2>/dev/null || true",
+        '    done',
+        "    docker network rm {$network} 2>/dev/null || true",
+        "    docker network create --attachable {$network} 2>/dev/null || true",
+        '    for c in $CONTAINERS; do',
+        "      [ -n \"\$c\" ] && [ \"\$c\" != \"coolify-proxy\" ] && docker network connect {$network} \"\$c\" 2>/dev/null || true",
+        '    done',
+        '  fi',
+        'fi',
+    ];
+}
+
 /**
  * Ensures all required networks exist before docker compose up.
  * This must be called BEFORE docker compose up since the compose file declares networks as external.
  *
+ * Also detects and fixes networks with IPv6 CIDR gateway notation that causes ParseAddr errors.
+ *
  * @param  Server  $server  The server to ensure networks on
  * @return \Illuminate\Support\Collection Commands to create networks if they don't exist
  */
@@ -140,17 +174,23 @@ function ensureProxyNetworksExist(Server $server)
 
     if ($server->isSwarm()) {
         $commands = $networks->map(function ($network) {
-            return [
-                "echo 'Ensuring network $network exists...'",
-                "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --driver overlay --attachable $network",
-            ];
+            return array_merge(
+                fixNetworkIpv6CidrGateway($network),
+                [
+                    "echo 'Ensuring network $network exists...'",
+                    "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --driver overlay --attachable $network",
+                ]
+            );
         });
     } else {
         $commands = $networks->map(function ($network) {
-            return [
-                "echo 'Ensuring network $network exists...'",
-                "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --attachable $network",
-            ];
+            return array_merge(
+                fixNetworkIpv6CidrGateway($network),
+                [
+                    "echo 'Ensuring network $network exists...'",
+                    "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --attachable $network",
+                ]
+            );
         });
     }
 
diff --git a/tests/Feature/DockerCustomCommandsTest.php b/tests/Feature/DockerCustomCommandsTest.php
index 5d9dcd174..74bff2043 100644
--- a/tests/Feature/DockerCustomCommandsTest.php
+++ b/tests/Feature/DockerCustomCommandsTest.php
@@ -198,3 +198,20 @@
         'entrypoint' => 'python -c "print(\"hi\")"',
     ]);
 });
+
+test('ConvertIp6', function () {
+    $input = '--ip6 2001:db8::1';
+    $output = convertDockerRunToCompose($input);
+    expect($output)->toBe([
+        'ip6' => ['2001:db8::1'],
+    ]);
+});
+
+test('ConvertIpAndIp6Together', function () {
+    $input = '--ip 172.20.0.5 --ip6 2001:db8::1';
+    $output = convertDockerRunToCompose($input);
+    expect($output)->toBe([
+        'ip' => ['172.20.0.5'],
+        'ip6' => ['2001:db8::1'],
+    ]);
+});